Yes, very safe indeed. Crystals are very intelligent. It has the ability to understand a conscious intention by you and the unspoken Divine intention for the highest good of its usage. Do bear in mind that our conscious intention can never override the unspoken Divine intention. This means that all conscious intention that is not of the highest good will void and be canceled out. In a nutshell, nothing can go wrong.
You may accidentally point the crystal to someone and fear that the energy from the point would then damage the energy body of the person. It is a myth. Crystals are far too intelligent to make such a mistake. As it is not for the highest good for anyone, no negative results can come off it.
More information on wands
http://xanxann.blogspot.com/2011/03/wands.html
